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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd20a326c656d19dd3a473a253d64c17b29629ee8643436893beae0b19f1f740' 
  AND token = 'HAMBXQOUz2v7RTF7Sd92+n8nasaQNJJDtSh5Y01f2Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}